Also Sam, following are is a link giving example about how to implement secondary sort and what it is...
http://codingjunkie.net/secondary-sort/ Regards, Shahab On Tue, Aug 13, 2013 at 3:51 PM, Sam Garrett <s...@actionx.com> wrote: > I am working on a MapReduce job where I would like to have the output > sorted by a LongWritable value. I read the Anatomy of a MapReduce Run in > the Definitive Guide and it didn't say explicitly whether reduce() gets > called only once per map output key. If it does get called only once I was > thinking that I could use this: > http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/Job.html#setSortComparatorClass(java.lang.Class)to > do the sorting. > > Thank you for your time. > > -- > Sam Garrett > ActionX, NYC >
